<template>
  <!-- 滑动验证码 -->
    <div ref="dragDiv" class="drag">
      <div class="drag_bg"></div>
      <div class="drag_text">{{ confirmWords }}</div>
      <div ref="moveDiv" :class="{'handler_ok_bg':confirmSuccess}" class="handler handler_bg"
           style="position: absolute;top: 0px;left: 0px;" @mousedown="mousedownFn($event)"></div>
    </div>
  </template>

<script>
export default {
  name: 'SliderVerification',
  data () {
    return {
      beginClientX: 0, /* 距离屏幕左端距离 */
      mouseMoveStata: false, /* 触发拖动状态  判断 */
      maxwidth: '', /* 拖动最大宽度，依据滑块宽度算出来的 */
      confirmWords: '拖动滑块验证', /* 滑块文字 */
      confirmSuccess: false /* 验证成功判断 */
    }
  },
  mounted () {
    this.maxwidth = this.$refs.dragDiv.clientWidth - this.$refs.moveDiv.clientWidth
    document.getElementsByTagName('html')[0].addEventListener('mousemove', this.mouseMoveFn)
    document.getElementsByTagName('html')[0].addEventListener('mouseup', this.moseUpFn)
  },
  methods: {
    mousedownFn: function (e) {
      if (!this.confirmSuccess) {
        e.preventDefault && e.preventDefault() // 阻止文字选中等 浏览器默认事件
        this.mouseMoveStata = true
        this.beginClientX = e.clientX
      }
    },
    // mousedoen 事件
    successFunction () {
      this.confirmSuccess = true
      this.confirmWords = '验证通过'
      if (window.addEventListener) {
        document.getElementsByTagName('html')[0].removeEventListener('mousemove', this.mouseMoveFn)
        document.getElementsByTagName('html')[0].removeEventListener('mouseup', this.moseUpFn)
      } else {
        document.getElementsByTagName('html')[0].removeEventListener('mouseup', () => {})
      }
      document.getElementsByClassName('drag_text')[0].style.color = '#fff'
      document.getElementsByClassName('handler')[0].style.left = this.maxwidth + 'px'
      document.getElementsByClassName('drag_bg')[0].style.width = this.maxwidth + 'px'
    },
    // 验证成功函数
    mouseMoveFn (e) {
      if (this.mouseMoveStata) {
        const width = e.clientX - this.beginClientX
        if (width > 0 && width <= this.maxwidth) {
          document.getElementsByClassName('handler')[0].style.left = width + 'px'
          document.getElementsByClassName('drag_bg')[0].style.width = width + 'px'
        } else if (width > this.maxwidth) {
          this.successFunction()
          console.log('验证成功')
        }
      }
    },
    // mousemove事件
    moseUpFn (e) {
      this.mouseMoveStata = false
      const width = e.clientX - this.beginClientX
      if (width < this.maxwidth) {
        document.getElementsByClassName('handler')[0].style.left = 0 + 'px'
        document.getElementsByClassName('drag_bg')[0].style.width = 0 + 'px'
      }
    }
  }
}
</script>

  <style scoped>
      .drag{
          position: relative;
          background-color: #e8e8e8;
          width: 100%;
          height: 34px;
          line-height: 34px;
          text-align: center;
      }
      .handler{
          width: 40px;
          height: 32px;
          border: 1px solid rgb(239, 243, 237);
          cursor: move;
      }
      .handler_bg{
          background: rgb(255, 255, 255) url("") no-repeat center;
      }
      .handler_ok_bg{
          background: rgb(59, 242, 3) url("") no-repeat center;
      }
      .drag_bg{
          background-color: #1d95e6f0;
          height: 34px;
          width: 0px;
      }
      .drag_text{
          position: absolute;
          top: 0px;
          width: 100%;text-align: center;
          -moz-user-select: none;
          -webkit-user-select: none;
          user-select: none;
          -o-user-select:none;
          -ms-user-select:none;
      }
  </style>
